In article <(E-Mail Removed)>,
"Mike Tyner" <(E-Mail Removed)> wrote:
> It works slightly different for near-vs-farsighted, but the overall
> thickness is predicted by the largest diameter you can measure in a given
> frame.
>
> With a squarish frame, you can measure increased width across the diagonals.
> If the lens is for nearsightedness, that extra thickness shows up in the
> corners. If the lens is for farsightedness, it affects thickness in the
> center. But square frames require more thickness than equivalent round
> frames, always. And sometimes designers like to spit in the face of physical
> limitations.
Then there is astigmatism. I think that's what killed me. The -10D was
bad enough, but then add 1.75D of astigmatism and they were pretty
darned thick.
In some sense they did work. When the eye doctor asked me about them, I
said they were unwearable, so he scheduled me for cataract surgery. I
was actually wearing contacts 14X7, and mostly wanted glasses for the
few hours between the time I took my contacts out and when I went to
bed. I also wanted them as backup if I had problems with the contacts
(which I never did, fortunately).
> I sometimes wonder if the designers actually wear glasses at all...
I suspect that both designers and models, if they normally wear glasses
at all, have less than 2 diopters of correction. It just doesn't matter
to them.
--
Dan Abel
Petaluma, California USA
(E-Mail Removed)